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Diphenhydramine Compound Linctus

Diphenhydramine Compound Linctus is a cough medicine that combines an antihistamine with other ingredients to relieve coughs and cold symptoms.

Last Modified: 17 May 2024

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What is Diphenhydramine Compound Linctus? 

Diphenhydramine Compound Linctus is a cough medicine that combines an antihistamine with other ingredients to relieve coughs and cold symptoms. 

Global Name

  • Generic name: Diphenhydramine Hydrochloride (as antihistamine), Ammonium chloride (as expectorant) and Sodium citrate (as mucolytic – loosens phlegm).
  • Brand names: Diphenhydramine Compound Linctus, as a specific formulation, may not have widespread brand names since it's often a generic medication made by various manufacturers.


What is Diphenhydramine Compound Linctus used for? 

The medication is used to treat coughs due to colds or allergies, providing relief from persistent coughing, runny nose, and sneezing. 

How do you use Diphenhydramine Compound Linctus? 


Diphenhydramine Compound Linctus is available as an oral syrup. 

Dosage information: 
  • Adults: 10 ml every 4 hours as needed. 
  • Children: Use is not recommended without a doctor's advice. 

  • Children: Consult a doctor. 
  • Adults: Suitable as per dosage instructions. 
  • Elderlies: May require a lower dose. 
  • Pregnancy: Use only if clearly needed and directed by a healthcare provider. 
  • Lactation: Consult a healthcare provider before use. 

  • Allergies: To diphenhydramine or other ingredients in the linctus. 
  • Medical Conditions: Severe high blood pressure, heart disease, respiratory depression, or if taking MAO inhibitors. 

May cause drowsiness. Do not operate machinery or drive after taking this medication. Avoid alcoholic beverages. 

Diphenhydramine may interact with other CNS depressants, anticholinergic drugs, and MAO inhibitors. 

Side Effects

Side effects can include drowsiness, dizziness, dry mouth, blurred vision, and gastrointestinal disturbances. 

Pharmacist Tips

  • Storage: Keep the linctus at room temperature away from light and moisture. Do not store in the bathroom, and keep out of reach of children and pets. 
  • Measuring: Use the provided dosing cup or a pharmacy-grade measuring device, not household spoons. 
  • Drowsiness: Be cautious of increased sedation if combined with alcohol or other sedatives. Avoid driving or operating machinery if affected. 
  • Medication Interactions: Always disclose all other medications to your healthcare provider to prevent adverse interactions. 
  • Hydration: Drink plenty of fluids to counteract dry mouth, a common side effect. 
  • Medical Advice: If symptoms persist or worsen, seek medical attention promptly, and watch for signs of allergic reactions. 


Where is Diphenhydramine Compound Linctus available in Hong Kong?

Diphenhydramine Compound Linctus is a prescription medication that can be prescribed by healthcare providers.


Is Diphenhydramine Compound Linctus for purchase over-the-counter?

It may be available OTC, but regulations vary. Always check with a pharmacist or your healthcare providers.

How long can I take Diphenhydramine Compound Linctus for a cough?

It should not be used for prolonged periods unless directed by a healthcare provider.

Can I take Diphenhydramine Compound Linctus if I have asthma?

Consult a healthcare provider before use, as it may not be recommended for asthmatic conditions. 

This website provides content related to drug use and medicine for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Do not use the information on this website to diagnose or treat a health problem or disease without consulting a qualified healthcare provider. The website's owners and contributors are not liable for any repercussions, adverse effects, or consequences resulting from the use of any medication or information provided herein.

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